Honestly it seems more like a light tank, and the Leman Russ seems like somewhere between medium and light itself, when compared to Malcador and Macharius chassis vehicles. So then what're the "actual" light tanks? Centaurs? I feel like they just wanna make everything seem bigger than it really is.

PS I hope the other Solar Auxilia and Horus Heresy stuff gets 40K rules, they're all such wonderful models